Fixed Inductors

Part Number	Description / PDF	Quantity
12LRS153C Murata Power Solutions	FIXED IND 15UH 3A 70 MOHM TH	0
84102C Murata Power Solutions	FIXED IND 1UH 2.8A 80 MOHM SMD	1204
32221C Murata Power Solutions	FIXED IND 220UH 960MA 141 MOHM	258
82224C Murata Power Solutions	FIXED IND 220UH 100MA 8 OHM SMD	0
22R473C Murata Power Solutions	FIXED IND 47UH 770MA 220 MOHM TH	32
33681C Murata Power Solutions	FIXED IND 680UH 920MA 183 MOHM	0
1415517C Murata Power Solutions	FIXED IND 1.5MH 1.7A 374 MOHM	0
33102C Murata Power Solutions	FIXED IND 1MH 760MA 221 MOHM TH	609
1422311C Murata Power Solutions	FIXED IND 22UH 11A 14 MOHM TH	2711
11R334C Murata Power Solutions	FIXED IND 330UH 190MA 3.6 OHM TH	0
29223C Murata Power Solutions	FIXED IND 22UH 1.2A 85 MOHM SMD	0
416R8C Murata Power Solutions	FIXED IND 6.8UH 5.7A 20 MOHM	25
18R224C Murata Power Solutions	FIXED IND 220UH 900MA 230 MOHM	947
12RS683C Murata Power Solutions	FIXED IND 68UH 1.8A 150 MOHM TH	0
26S101C Murata Power Solutions	FIXED IND 100UH 1.05A 250 MOHM	500
22R154C Murata Power Solutions	FIXED IND 150UH 520MA 540 MOHM	705
1410454C Murata Power Solutions	FIXED IND 100UH 5.4A 46 MOHM TH	2967
1468373C Murata Power Solutions	FIXED IND 68UH 7.3A 25 MOHM TH	6
46281C Murata Power Solutions	FIXED IND 280NH 8.7A 8 MOHM SMD	0
12LRS155C Murata Power Solutions	FIXED IND 1.5MH 310MA 3.4 OHM TH	0

Fixed Inductors

1. Overview

Fixed inductors are passive electronic components designed to store energy in magnetic fields when electrical current flows through them. Unlike variable inductors, their inductance values remain constant during operation. These components play critical roles in filtering, signal processing, energy storage, and electromagnetic interference (EMI) suppression across modern electronics, including power supplies, communication systems, and automotive electronics.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Wirewound Inductors	High precision, high current handling, low resistance	Power supplies, DC-DC converters
Chip Inductors	Compact SMD package, stable performance at high frequencies	Mobile devices, RF circuits
Ferrite Bead Inductors	Effective high-frequency noise suppression	EMI filtering in digital circuits
Thin-Film Inductors	Ultra-compact, high Q-factor, tight tolerance	5G communication modules, IoT devices

3. Structure and Composition

Typical fixed inductors consist of:

Magnetic Core: Made from ferrite, powdered iron, or composite materials to concentrate magnetic flux
Coil Structure: Copper wire wound around the core (enamelled or silver-plated)
Encapsulation: Molded resin or ceramic coating for mechanical protection and insulation
Terminations: Solder-coated ends for PCB mounting (for SMD types) or leaded connections

4. Key Technical Specifications

Parameter	Description	Importance
Inductance (L)	Measured in henrys (H), determines energy storage capacity	Defines filtering/energy storage performance
Rated Current (I_rated)	Maximum DC current before saturation	Prevents core saturation and failure
DC Resistance (DCR)	Resistance of coil windings	Affects efficiency and thermal performance
Self-Resonant Frequency (SRF)	Frequency where inductor behaves as capacitor	Limits effective operating frequency range
Q Factor	Quality factor indicating efficiency	Higher Q = lower energy losses

5. Application Fields

Consumer Electronics: Smartphones, laptops, LED drivers
Industrial Equipment: Motor drives, power inverters
Automotive Systems: ECU modules, EV battery management
Telecom Infrastructure: Base station filters, optical transceivers

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Murata	LQH3NPN100M	10 H, 1.2A, 1.8 1.4mm chip inductor
TDK	MLZ2012A100T	100MHz SRF, 1.0 1.25mm for RF circuits
Vishay	IHLP2525CZER1R0M	1 H, 12A, composite construction
Coilcraft	0402DC-103J	10 H, 5% tolerance, ultra-low profile

7. Selection Guidelines

Key considerations during selection:

Calculate required inductance based on switching frequency and ripple current
Verify rated current exceeds maximum operating current by 20-30%
Select SRF higher than circuit operating frequency
Consider package size vs. thermal dissipation requirements
For EMI suppression: Choose ferrite beads with impedance curves matching target frequencies

8. Industry Trends

Current development trends include:

Miniaturization: Sub-0.5mm size inductors for wearable devices
High-Frequency Operation: Components supporting >10GHz 5G applications
Integrated Solutions: Combined inductor-filter modules
Material Innovation: Nanocrystalline cores for higher saturation flux
Automotive Focus: AEC-Q qualified parts for EV/HEV systems